Telegraph-instrument



3 Sheets-Sheen 1'.

(No Model.)

0. G. BURKE.

TELEGRAPH INSTRUMENT.

Patented Nov. 29, 1887 w wwem 334 1 014 Cute WW kvLhhngnbhcr. Wi-hin ion, D Q

(No Model.) 3 Sheets-Sheet 2.

O. G. BURKE.

TELEGRAPH INSTRUMENT.

No. 374,038. Patented Nov. 29, 1887.

WQ A N. PETERS. Phnko-Lithugnpher, wnsnin tan. n. C.

- (No Model.) 3 Sheets- Sheet a.

G. G. BURKE.

TELEGRAPH INSTRUMENT.

No. 374,038. Patented Nov. 29, 1887.

m ue nm 25314 My dkbozmqo UNITED STATES PATENT OFFICE.

CHARLES G. BURKE, OFv RICHMOND HILL, NEW YORK.

TELEGRAPH-INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 374,038, dated November 29, 1887.

Application filed January 22, 1887.

To all whom, it may concern.-

Be it known that I, CHARLES G. BURKE, a citizen of the United States, residing in Richmond Hill, in the county of Queens and State of New York, have invented certain new and useful Improvements in Telegraphic Instruments, of which the following is a specification.

The invention relates to the class of apparo ratus employed for receiving telegraphic messages and either making a record of the same or retransmitting them upon other conductors.

The object of the invention is to provide a sensitive instrument and one capable of being I 5 employed for receiving and repeating messages and dispatches transmitted over long lines or embodied in electric currents of small power.

The invention is especially adapted to be employed in connection with submarine cables,

where the currents require that the receivinginstrument shall be extremely sensitive.

The general principle upon which the inven tion is constructed consists in placing a coil or solenoid of insulated wire in the circuit of the line and providing therefor an intense magnetic field consisting, preferably, of two opposite magnetic poles derived from one or more electro-inagnets. One of the poles en- 0 circles one end of the coil, while the other extends within the other end. The two poles combine in their action upon the solenoid to moveit in one direction or the other, according to the character of the current transmitted through the solenoid. The movements of the solenoid may be employed for operating a siphon of the character usually employed in telegraphiccable systems, or it may be employed for operating a circuit-controlling device adapted to 0 open and close the connections of an independ ent electric circuit. Such circuit may be employed for retransmitting upon an independent line or for operating a recording-instrument or sounder of any suitable character. It

is usuallypreferred to employ two solenoids of the character described, causing them to assist each other.

The invention will be described in detail in connection with the accompanying drawings,

in whic Figure 1 illustrates the general principles Serial No. 225,070. (No model.)

upon which the invention is constructed, and Fig. 2 is a cross-section of the solenoid. Fig. 3

is an elevation of the receiving instrument,

and Fig. 4 is a transverse section of the instrument.

- Referring to Figs. 1 and 2, L represents a main line, in which are included the coils of a solenoid, A. The main line is continued from these coils to the earth at G. In thisinstance the section of the main line including the coils is illustrated as being fastened at two points, 0 and c and the coil A is suspended in its proper position thereby. A field is established for the solenoid by means of the electro-magnet B. This has its two poles, I) and b", prolonged by extensions 6 and 6 The extension e is provided with a cup, d, which extends over one end of the solenoid and projects nearly to the center of the same. The other projection, e, passes within the coil or solenoid from the opposite end. The two poles are of opposite polarity, the core being wound with coils D and D which are connected in the circuit of the battery 0. hen a current is transmitted through the line L, the solenoid A will swing toward the right hand or toward the left hand, accordingly as the current is in one direction or the other. Any required attachment may be applied to the coil or solenoid for the purpose of employing the instrument as a receiver. I

The application of the instrument will be describedin connection with Figs. 3 and 4. In this instance two solenoids, A and A", are employed. These are carried upon opposite arms of a pivoted lever, F. The main line is connected by a conductor, 25', with an insulated screw, it, upon the lever or its axis; thence by a conductor, t", through the coils of the solenoid A; thence by a conductor, If, either with the lever and thus with a conductor, t, or directly with the latter; thence through the coil A and through the conductor t attached to a support, a", and thence to the outgoing section of the line L. These connections may of course be variously modified. Two fieldmagnets, B and B are employed, and they are included in the circuit of the battery 0. They are so wound and connected that the pole b of the magnet B will be of opposite polarity from the pole b of the magnet B and likewise the pole b" of the magnet B is opposite in character from that pole b of the same magnet and the pole b of the magnet B. The pole b of the magnet B is constructed with a cupshaped extension, d, en-

circling the corresponding end of the solenoid, while the pole b enters within the other end. The pole b of the magnet B passes within the coil A and the extension d surrounds the other end of the same coil. The cupshaped extensions d and d are preferably integral with the respective cores to which they are applied. The two coils A and A are included in the circuit of the main line of the system to which the instrument is to be applied, and they combine, when traversed by an electric current, to move the lever F in one direction or the opposite. The movements of thelever thus occasioned are employed for controlling the connections, in this instance of an independent circuit derived from a battery, 0. The connections of this battery are as follows: from one pole, by means of conductors 1 and 2, to two contact-points, 7c and if, applied to an arm or extension, at, at one end of the lever F. This extension is in electrical connection, through the lever F, with a conductor, 3, attached to a suitable non-conducting support, f, thence bya conductor, 4, back to the battery. The conductor 3 is of fine wire, and is so arranged as not to interfere with the movements of the lever F. When, therefore, the lever is actuated in one direction, it will close the circuit through the conductor 1. When in the opposite direction, it will close the circuit through the conductor 2. Two instruments, K and K are respectively includedin these conductors,and one or the other will therefore be actuated, according to the direction of movement of the lever F. The instruments K and K are employed for operating receiving-instruments or repeaters B and It", in a manner well understood, which need not here be described. Contactpoints i and i may be applied to an extension, at, carried at the oppositeend of thelever F, and by having this extension insulated from the extension n the connections of an independent circuit may be controlled, if desired.

To guard against the accidental failure of good contacts being made it may in some instances be desired to connect the points z" and it together, and likewise the points and t, and have them co-operate wit-h each other.

It should be observed that the lines of force are directed obliquely through the solenoids. This is due to the fact that two poles of opposite character are presented to opposite ends of the solenoids, and neither pole covers it completely, so that there is a point of higher magnetic influence with reference to each pole thanthat occupied by the solenoid when at rest, and therefore the solenoid, when traversed by a current of electricity, will move toward one pole or the other of the magnet, according to the direction of the current and the consequent magnetic tendencies of the sol'enoid.

In some instances it may be desirable that the movement of the lever F should receive a slight steadying influence, and for this purpose the arms a and m are bent downward, as shown, and carry at their respective extremities small balls 19 and p", which enter glycerine-cups I and P They are thus immersed in glycerine or some other suitable fluid. This device is found to afford the required resistance to the movement of the lever and give an even and reliable action. Such a device, however, is not always essential.

I claim as my invention 1. The combination, substantially as hereinbefore set forth, of a solenoid, a magnet applied thereto, a polar extension from one pole of said magnet surrounding one end only of the solenoid, and a polar extension from the other end of the same magnet passing within the opposite end of the solenoid.

2. The combination of two solenoids, two electro-magnets having poles of opposite character presented to the opposite ends of the solenoids, and a support common to both solenoids.

3. In a telegraphic instrument, a solenoid designed to be included in the main line, a support for the same, and two magneticpoles of opposite character, one surrounding one end only of the solenoid and the other extending from the opposite direction into the other end of the solenoid, the two together directing lines of force obliquely through the coils of the solenoid, substantially as described.

4:- The combination of a lever, two soleir oids carried thereby, and an electro-magnet having one pole encircling one end of onesolenoid and the other pole entering one end of the other solenoid.

5. The combination of two solenoids, a lever carrying the same, and two electro-magnets creating fields therefor, one electro-magnet having a pole encircling one end of one solenoid and another pole entering the other solenoid, and the other electro-magnet having one pole encircling the last-named coil and the other pole entering the remaining end of the first-named coil.

6. In a receiving-instrument, the combination of a solenoid and two magnetic poles presented to opposite ends thereof, combining to direct their lines of force obliquely through the solenoid, one pole entering one end and the other surrounding the other end of the solenoid, an indicating or recording device operated by the movements of the solenoid, and means for transmitting currents through the solenoid, substantially as described.

7. A receivinginstrument consisting of the combination of a solenoid, a magnetic pole extending within said solenoid, a magnetic pole lenoid, permitting itto move in the direction of its length, and a receiving device actuated by the-movements of the Solenoid.

8. The combination of two Solenoids, a pivoted lever carrying the same, two field-magnets, each having one pole presented to each solenoid, and a receiving-instrument actuated by the movements of the lever. 9. The combination of a pivoted lever, one or more. solenoids carried thereby, constant field-magnets therefor, a receiving-instrument operated by the movements of the lever, and one or more dash-pots for the lever, each consisting of an arm extending therefrom and a fluid-containing cup receiving the arm.

10. The combination, in a receiving-instrument, of apivoted lever, two solenoids carried at the respective ends thereof, two field-magnets creating fields of force therefor, two circuit-controlling arms extending from the re- 20 spective ends of the lever and contact-points applied thereto, arms projecting therefrom, and dash-pots receiving the same.

11. In a receiving-instrument, the combination of a field-magnet and coil, one pole of the 25 field-magnet being within the coil, and the other pole of said magnet surrounding said coil, but not surrounding any portion of the other pole of said magnet within said coil.

In testimony whereof Ihave hereunto sub- 0 scribed my name this 20th day of January, A.

CHARLES G. BURKE. l/Vitnessesz DANL. W. EDGECOMB, CHARLES A. TERRY. 

